An electron gun is a device for generating an electron beam.

This story perfectly practices the principle of Chekhov's gun.

The police used a water cannon against the demonstrators.

He carefully aimed the rifle.

There was a gunshot wound left on his chest.

He shot the enemy with a machine gun.

He likes to take a walk in the park at dusk.

He worked as a rear gunner in a fighter plane.

He entered the forest with a shotgun.

They are always together like the Three Musketeers at school.